Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde6475ebea0dc55…

MALICIOUS

PDF

79.0 KB Created: 2021-03-21 02:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a4a617813222a7bf54c0b1cfdd352f3a SHA-1: 4b24d6dd4593c683714936055abdc24ff43efbe7 SHA-256: cde6475ebea0dc55b36b15000f99552ad0e09dfb0e00308f79fcd3b98ea8134c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to a domain associated with phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to 'geometry section 2.2 answers', suggesting a phishing pretext to drive users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://maypoin.ru/wix?keyword=geometry+section+2.2+answers PDF link annotation
    • http://playmarket-online.com/19983976948sv2tp.pdfIn PDF document text
    • http://vvd.bar/74247786277tikng.pdfIn PDF document text
    • http://nesobaka3.xyz/bhagwat_geeta_yatharoop_downloadygvat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_6018a98bafc6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_604a771f1b62b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501989/normal_5fccb9767a4a1.pdfIn PDF document text
    • http://in-step.shop/does_tricare_cover_dependents932a4.pdfIn PDF document text
    • http://fitness-ital.fun/63504843200jek7a.pdfIn PDF document text
    • http://carinsusa.com/11207926933un4su.pdfIn PDF document text
    • http://suboxobuwofum.iblogger.org/the_definite_and_indefinite_article_in_english.pdfIn PDF document text
    • http://terem.space/sujugusipyzdaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lurotibiripan.rf.gd/pususolewusenew.pdfIn PDF document text
    • http://fuvogixerad.epizy.com/aptis_test.pdfIn PDF document text
    • http://robeguf.epizy.com/4129402745.pdfIn PDF document text
    • http://pirokogux.epizy.com/gipabiwotaxobeki.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/botoseruwanexetegaxijuzuf.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/mens_formal_shirt_collar_styles.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/98288114248.pdfIn PDF document text
    • http://jokipuzovorije.epizy.com/dodomutemeduvasabaxefa.pdfIn PDF document text
    • http://vumoxijesep.epizy.com/learn_japanese_language_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/carbenes_nitrenes_and_arynes.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 5300 bytes
SHA-256: 26906cba0e8d759043d1b472d212a76b9ac38ba4ccdc34dec75e0212fe67a4fe
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 12364 bytes
SHA-256: 2c406e55dbe6ab8cec6c69acfd16557bb4a4e4f88882590380be7467ac24146a

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